Foletti started his professional career in his hometown at Mendrisio before moving to Grasshoppers, where he was mainly a substitute.

In 2002, after a shortage of goalkeepers at Derby County, he was brought in on loan and appeared twice, first coming off the bench for the injured Andy Oakes in a 3–0 win vs Leicester City[4] and playing the whole match in a 3–4 loss against Everton exactly one month later.

[5] Foletti moved back to Switzerland in the following season, joining SC Kriens where he played until his retirement in 2007.

He stayed with the club until 2011, when he was assigned the goalkeeping coach duty at Switzerland national team working both with senior and youth sides.

This biographical article related to a football goalkeeper from Switzerland is a stub.